记第一个Hibernate的实现
废话不多说，直接上代码！
1、新建java project导入所需jar包，
（注：文中可以使用自己建的hibernate library，也可以直接导入jar包）
2、以student类来演示不使用annotation的方式，以文件目录为顺序的代码：
StudentTest 类：
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import com.bjsxt.hibernate.Student;
public class StudentTest {
public static void main(String[] args) {
Student student = new Student();
student.setId(1);
student.setName("yuyu");
student.setAge(23);
Configuration cfg = new Configuration();
SessionFactory sf = cfg.configure().buildSessionFactory();
Session session = sf.openSession();
session.beginTransaction();
session.save(student);
session.getTransaction().commit();
session.close();
sf.close();
}
}
Student 类：
package com.bjsxt.hibernate;
public class Student {
private int id;
private String name;
private int age;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
Student.hbm.xml的配置：
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.bjsxt.hibernate.Student">
<id name="id" />
<property name="name" />
<property name="age" />
</class>
</hibernate-mapping>
Hibernate.cfg.xml的配置：
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/hibernate</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property>
<!-- JDBC connection pool (use the built-in) -->
<!-- <property name="connection.pool_size">1</property>-->
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Enable Hibernate's automatic session context management -->
<!-- <property name="current_session_context_class">thread</property>-->
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<!-- <property name="hbm2ddl.auto">update</property>-->
<mapping resource="com/bjsxt/hibernate/Student.hbm.xml"/>
</session-factory>
</hibernate-configuration>
3、以teacher类来演示使用annotation的方式，以文件目录为顺序的代码：
（注意：在导入jar包的时候比上个工程多导入了一个jar包，如图所示最下面的jar包）
TeacherTest 类：
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
import com.bjsxt.hibernate.Teacher;
public class TeacherTest {
public static void main(String[] args) {
Teacher teacher = new Teacher();
teacher.setId(1);
teacher.setName("yaya");
teacher.setAge(23);
teacher.setTitle("高级教师");
Configuration cfg = new AnnotationConfiguration();
SessionFactory sf = cfg.configure().buildSessionFactory();
Session session = sf.openSession();
session.beginTransaction();
session.save(teacher);
session.getTransaction().commit();
session.close();
sf.close();
}
}
Teacher 类：
package com.bjsxt.hibernate;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class Teacher {
private int id;
private String name;
private int age;
private String title;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
@Id
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
Hibernate.cfg.xml的配置：
仅仅将上个工程的
<mapping resource="com/bjsxt/hibernate/Student.hbm.xml"/>
改为：
<mapping class="com.bjsxt.hibernate.Teacher"/>
4、工程中可能用到的sql语句，在mysql建表：
create database hibernate;
drop table student;
create table student(id int primary key,name varchar(20),age int);
select * from student;
drop table teacher;
create table teacher(id int primary key,name varchar(20),age int,title varchar(20));
select * from teacher;
OK，收工！